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Derivatives (Unrealized and Realized Derivative Gains (Losses) Forward Contracts) (Details) (Forward Contracts, USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Derivative [Line Items]                
Realized and unrealized (losses) gains $ (0.5) $ 0.3 $ (0.3) $ 0.3        
Sales/settlements 0.5 0 0.3 0        
Derivative, fair value, net (0.1) 0.3 (0.1) 0.3 (0.1) (0.1) 0 0
Purchases 0 0 0 0        
United States of America, Dollars
                
Derivative [Line Items]                
Realized and unrealized (losses) gains (0.4) 0.4 (1.0) 0.4        
Derivative, fair value, net (0.1)   (0.1)     0    
Sweden, Kronor
                
Derivative [Line Items]                
Realized and unrealized (losses) gains 0 0 0 0        
Derivative, fair value, net 0   0     0    
Euro Member Countries, Euro
                
Derivative [Line Items]                
Realized and unrealized (losses) gains (0.1) (0.1) (0.1) (0.1)        
Derivative, fair value, net 0   0     (0.1)    
United Kingdom, Pounds
                
Derivative [Line Items]                
Realized and unrealized (losses) gains 0 0 0.8 0        
Derivative, fair value, net $ 0   $ 0     $ 0